01 - Preheat the oven to 425°F. Line a baking sheet with parchment paper.
02 - In a mixing bowl, combine the flour, sugar, baking powder, baking soda, and salt. Cut in the cold butter using a pastry blender or your fingers until the mixture resembles coarse crumbs.
03 - Stir in the buttermilk just until a soft dough forms. Do not overmix.
04 - Drop 6 mounds of dough onto the prepared baking sheet. Flatten slightly with your fingers.
05 - Bake for 12 to 15 minutes, or until golden brown. Cool completely, then cut into bite-size cubes.
06 - While the shortcakes bake, combine the sliced strawberries, granulated sugar, and lemon juice in a bowl. Toss to coat and let macerate for at least 15 minutes until juices are released.
07 - In a chilled bowl, whip the heavy cream with powdered sugar and vanilla extract until soft peaks form.
08 - Layer shortcake cubes, strawberries with juices, and whipped cream in serving glasses. Repeat layers to fill each glass. Finish with a dollop of whipped cream and additional fresh strawberries if desired.
09 - Serve immediately, or chill up to 2 hours before serving.